JPH097510A - Formation of aluminum oxide film on cathode-ray tube panel - Google Patents

Abstract

PURPOSE: To provide a method by which an aluminum oxide film of 1μor more in thickness is simply formed on a cathode-ray tube panel in single applying process. CONSTITUTION: Inside the weirs of a cathode-ray tube panel 1 having the weirs such as skirt portions 3 which can block the outflow of liquid on the periphery, aluminum oxide solution Z which is somewhat more than the necessary amount for film forming is poured, and a panel face 2 is leveled and is left for required time so as to stabilize the viscosity of the aluminum oxide solution Z. The cathode-ray tube panel 1 is tilted by a required angle so as to accumulate the extra aluminum oxide solution Z downward to exhaust from the inside of the weirs by such a method as suction. The panel face 2 is arranged in a level, and the aluminum oxide solution Z on the cathode-ray tube panel 1 is heated, dried, and burnt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an aluminum oxide film on the surface of a panel glass of a cathode ray tube used for displaying various images to prevent browning (browning) due to an electron beam. Is.

[0002]

2. Description of the Related Art Conventionally, as a cathode ray tube, there has been known one in which a film containing aluminum oxide as a main component is formed on a surface of a panel glass on an electron beam irradiation side (for example, Japanese Utility Model Publication No. 58-46517). Then, as a method of forming this aluminum oxide coating, a solution containing commercially available aluminum oxide is poured onto the panel glass, the panel glass is rotated and revolved by a spin coater, and the solution is diffused, followed by drying. (Spin coating) is known.

[0003]

In the case of the above-mentioned conventional spin coating method, when a film having a thickness of 1 micron or more is formed, the coating and drying steps are required twice or more. Therefore, it is an object of the present invention to provide a method for producing a film of aluminum oxide having a thickness of 1 micron or more on a cathode ray tube panel by a single coating process and a simple apparatus.

[0004]

In the present invention, in order to solve the above problems, weirs of the cathode ray tube panels 1 and 11 which have a weir such as a skirt portion 3 which can prevent the outflow of liquid around. The aluminum oxide solution Z, which is slightly larger than the amount required for film formation, is poured on the inside of the plate, and then the panel face 2 is made horizontal and left for a required time to stabilize the viscosity of the aluminum oxide solution Z. The cathode ray tube panels 1 and 11 are inclined at a required angle, the excess aluminum oxide solution Z is collected downward and discharged from the inside of the weir by a method such as suction, and then the panel face 2 is horizontally arranged to form a cathode ray tube. Aluminum oxide solution Z on panels 1 and 11
A film-forming method of heating and drying the film, and then baking the film was adopted. If the panel face 2 is smooth, pour the aluminum oxide solution Z in an amount necessary for film formation,
A method of performing the steps of drying and firing as it is while maintaining the horizontal was adopted.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. 1 to 4 are explanatory views of a first embodiment of the present invention, FIG. 5 is an explanatory view of a second embodiment of the present invention, and FIG.
FIG. 3 is a schematic sectional view of a cathode ray tube.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, the cathode ray tube panel 1 is
It has a flat panel face 2 and a skirt portion 3 standing upright on the periphery thereof. The skirt portion 3 constitutes a weir capable of blocking the outflow of the liquid injected onto the panel face 2.

When a film of aluminum oxide is formed on the panel face 2 of the cathode ray tube panel 1, first, the cathode ray tube panel 1 is washed and dried, and then, as shown in FIG. 1, the inside of the skirt portion 3 serving as a weir. Then, a slightly larger amount of the aluminum oxide solution Z than that required for film formation is poured. The aluminum oxide solution Z is a milky white viscous liquid in which polymer particles are dispersed as an anion in water with alumina hydrate (boehmite type) having a colloidal size of 5 mμ to 200 mμ, such as Nissan. Alumina sol (trade name) manufactured by Kagaku Kogyo Co., Ltd. and Cataloid A (trade name) manufactured by Catalyst Kasei Kogyo Co., Ltd. can be used. The solution can be diluted with water or alcohol in order to adjust the thickness of the formed aluminum oxide film.

After pouring the aluminum oxide solution Z, the aluminum oxide solution Z is oscillated for leveling, and as shown in FIG. 2, the panel face 2 is leveled and left for a required time to stabilize the viscosity.

Thereafter, as shown in FIG. 4, the cathode ray tube panel 1 is tilted at a required angle, excess aluminum oxide solution Z is collected downward, and the suction device 4 discharges it from the inside of the skirt portion 3. Since the aluminum oxide solution Z has a thixotropic property, the thickness of the formed aluminum oxide film depends on the time from the injection of the aluminum oxide solution Z to the discharge of the excess solution.
This time must be fixed and processed.

After that, the panel face 2 is made horizontal, and the aluminum oxide solution Z on the cathode ray tube panel 1 is made 1
Heat drying at a temperature of 00 ° C. or lower.

After that, the cathode ray tube panel 1 is placed in a heating furnace, and aluminum oxide is baked at 400 ° C. to 470 ° C.

With the above-mentioned single treatment, the aluminum oxide film having a thickness of 1 μm or more can be formed on the cathode ray tube panel 1. Further, according to this method, a substantially uniform aluminum oxide film can be formed not only on a flat panel face but also on a curved surface such as a spherical surface or a cylindrical surface.

In another embodiment shown in FIG. 5, the cathode ray tube panel 11 is flat and has no skirt portion. In this case, the adhesive tape 5 is attached to the periphery of the cathode ray tube panel 11 to form a weir for blocking the outflow of the aluminum oxide solution Z. After that, the treatment up to the drying of the solution is the same as that in the previous embodiment, and thereafter, the adhesive tape 5 is removed and firing is performed.

Still another embodiment not shown applies only to cathode ray tube panels having a smooth panel face. That is, after injecting an amount of aluminum oxide solution Z required for film formation into the cathode ray tube panels 1 and 11 shown in FIG. 1 or 5, the cathode ray tube panels 1 and 11 are horizontal and the aluminum oxide solution Z is heated as it is. ,dry. Then, after removing the adhesive tape 5 from the cathode ray tube panel 11 as it is and from the cathode ray tube panel 11, it is heated to 400 ° C. to 470 ° C. in a heating furnace to bake aluminum oxide.

[0015]

As described above, according to the present invention, a film is formed inside the weir of the cathode ray tube panels 1 and 11 which has a weir such as the skirt portion 3 which can prevent the outflow of liquid. A slightly larger amount of the aluminum oxide solution Z than necessary for the aluminum oxide solution Z is poured, and then the panel face 2 is kept horizontal for a required time to stabilize the viscosity of the aluminum oxide solution Z, and then the cathode ray tube panel 1, 11 is tilted at a required angle, excess aluminum oxide solution Z is collected downward and discharged from the inside of the weir by a method such as suction, and then the panel face 2 is horizontally arranged to make the cathode ray tube panels 1, 1.
The aluminum oxide solution Z on 1 is heated and dried, and then the film is formed, and when the panel face 2 is smooth, the aluminum oxide solution Z in an amount necessary for film formation is used. Since it employs a method of pouring liquid, keeping it horizontal, and performing the process of drying and baking as it is, the thickness of 1 micron or more can be easily applied to the cathode ray tube panel by a single coating process and without using a special complicated device. It has an effect that a film of aluminum oxide can be produced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of the present invention step by step.

FIG. 2 is an explanatory diagram sequentially showing a first embodiment of the present invention.

FIG. 3 is an explanatory diagram sequentially showing a first embodiment of the present invention.

FIG. 4 is an explanatory diagram sequentially showing a first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1,11 Cathode ray tube panel 2 Panel face 3 Skirt part 5 Adhesive tape Z Aluminum oxide solution

Claims (4)

[Claims] 1. A method for forming a film of aluminum oxide on a cathode ray tube panel having a skirt portion around which a liquid can be prevented from flowing out, which is necessary for forming a film on the inside of the skirt portion of the cathode ray tube panel. A step of pouring a larger amount of aluminum oxide solution than that, and then leaving the panel face horizontal for the required time, and then tilting the cathode ray tube panel at the required angle and collecting the excess aluminum oxide solution downward. The step of discharging from the inside of the skirt part, the step of heating and drying the aluminum oxide solution on the cathode ray tube panel with the panel face horizontal, and the step of baking the aluminum oxide on the cathode ray tube panel thereafter. A method of forming an aluminum oxide film on a cathode ray tube panel, comprising: 2. When the cathode ray tube panel is a flat panel without a skirt portion, a tape is attached to the peripheral edge of the flat panel to form a weir for preventing liquid outflow, Inside the weir made of tape, a step of pouring a larger amount of aluminum oxide solution than that required for film formation, followed by a step of leaving the panel face horizontal for the required time, and then tilting the cathode ray tube panel at the required angle. Then, a step of collecting excess aluminum oxide solution downward and discharging it from the inside of the weir, a step of removing the tape forming the weir, and a horizontal panel face after that, oxidation on the cathode ray tube panel. A cathode ray tube panel, comprising: a step of heating and drying an aluminum solution; and a step of subsequently firing aluminum oxide on the cathode ray tube panel. Method of forming an aluminum oxide film. 3. A method of forming an aluminum oxide film on a cathode ray tube panel having a skirt portion which can prevent the outflow of a liquid and having a smooth panel face, the skirt portion of the cathode ray tube panel. Inside, the step of pouring the amount of aluminum oxide solution required for film formation, the step of heating the aluminum oxide solution on the cathode ray tube panel with the panel face horizontal, and then the cathode ray tube panel. A method of forming an aluminum oxide film on a cathode ray tube panel, comprising the step of firing the above aluminum oxide. 4. When the cathode ray tube panel is a flat panel without a skirt, a tape is attached to the peripheral edge of the flat panel to form a weir for preventing the outflow of liquid, Inside the weir with tape, a step of pouring an amount of aluminum oxide solution necessary for film formation, and then a step of heating and drying the aluminum oxide solution on the cathode ray tube panel with the panel face horizontal, and thereafter, A method of forming an aluminum oxide film on a cathode ray tube panel, comprising: a step of removing a tape forming a weir; and a step of baking aluminum oxide on the cathode ray tube panel thereafter.